Safety device for elevators.



A. KALNASI.

SAFETY DEVICE FOR ELEVATORS.

APPLICATION FILED NOV. 4, 1912.

1,081,312, Patented Dec 16,1913. Hen EA,

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WITNESSES INVENTOR ANDY KALnAsr, or senses ROAD, rnnnsviivanra.

SAFETY DEVICE FOR ELEVATORS.

Specification of Letters Patent. Application filed November 4, 1912.

Patented Dec. 16, 1913. Serial No. 729,436.

To all whom it may concern Be it known that I, ANDY KALNAsI, a subject of the King of Hungary, residing at Forbes Road, in the county of WVestmoreland and State of Pennsylvania, have invented certain new and useful Improvements in Safety Devices for Elevators, of which the following is av specification.

This invention relates to a safety device for elevators, and more particularly to that type of elevator or cage that is hoisted through the medium of a cable.

The primary object of my invention is to provide the top of an elevator cage with simple and effective means for engaging the guides of a cage and retarding and eventually stopping of movement of the cage when the hoisting cable thereof breaks or becomes unfastened.

A further object of this invention is to provide a strong and durable safety device that can be advantageously used in connection with freight elevators, the device being positive in its action and thereby preventing the loss of lives and a destruction of property when a hoisting cable breaks.

With the above and other objects in View, the invention resides in a novel construction, combination and arrangement of parts to be hereinafter specifically described and then claimed.

Reference will now ing, wherein Figure 1 is a front elevation of a portion of an elevator cage provided with a safety device, showing the gripping arms in a retracted position. Fig. 2 is a similar view showing the gripping arms in an extended position, and Fig. 3 is a horizontal sectional view of the safety device.

F urther describing my invention in detail with reference to the drawing wherein he had to the drawlike numerals denote corresponding parts throughout: 1 denotes the vertical oppositely disposed frames of an elevator shaft and the confronting sides of these frames are provided with guides 2 having transverse teeth or shoulders 3.

4- denotes the top of an elevator cage and located centrally of the top of said cage is a vertical strap 5 that has an opening 6 vertically alining with an opening 7 in the top of an elevator cage.

8 denotes a bolt movably mounted in the openings 6 and 7, said bolt having the lower end thereof threaded, as at 9 and the upper end thereof provided with an eye 10 to which is connected the hoisting cable 11 of the elevator cage. Screwed upon the threaded end of the bolt 8 are nuts 12, these nuts being spaced apart and limiting the move ment of the bolt 8 in the openings 6 and 7.

13 denotes a cross head mounted upon the bolt 8, intermediate the ends thereof, and this cross head has the ends thereof bifurcated, as at 14 and provided with transverse pivot pins 15 for the inner ends or long arms of hell cranks or angle levers 16. These levers have the outer ends thereof pivotally mounted by transverse pins 17 in housings 18 located at the sides of the elevator cage 4:. The outer ends or short arms of said levers are within the housings 18 and are pivotally connected, as at 19 to gripping arms 20 slidably mounted Within the housings 18. The gripping arms 20 are adapted to engage the teeth or shoulders 3 of the guides 2 and the ends of said arms are beveled, as shown in Fig. 2.

21 denotes a coiled compression spring encircling the bolt 8, between the strap 5 and the cross head 13, this spring being retained under tension during the ordinary operation of the elevator cage.

Under ordinary conditions, the gripping arms 20 are retracted, as shown in Fig. 1, but should the hoisting cable 11 break or become unfastened the coiled compression spring 21 immediately lowers the bolt 8 and moves the levers 16 whereby the gripping arms 20 will be extended into the path of the teeth or shoulders 3. The gripping arms will. engage the teeth or shoulders and prevent a sudden descent of the elevator cage when the hoisting cable thereof breaks. The elevator cage is s: fely supported until repairs can be made, at which time the safety device is restored to its normal posi tion and is again ready for instant use.

What I claim is In a safety device for elevators, the combination with guides having teeth, an ele vator cage movable between said guides and a hoisting cable for said cage, of an inverted yoke-shaped strap fixed to the top of said cage. a vertically movable bolt loosely extending through the top of the cage and through said strap and provided with upper and lower stops for limiting the upward and downward movement thereof, a cross head fixed to said bolt above the upper stop and having each end bifurcated, a pair of bell crank levers each including a short and a long arm, said elongated arms having their inner ends pivotally connected in the bifurcated ends of said cross head, housings carried by the top of said cage, longitudinally extending gripping arms mounted in said housings, means for pivotally connecting said levers 1n said housings, means for plvotally connecting the free ends of the short, 10 arms of said levers in the inner ends of said arms, and a coiled spring carried by the bolt and interposed between said cross head and the top of said strap.

In testimony whereof I afiix my signature in presence of two witnesses.

ANDY KALNASI.

Witnesses W. S. WANGAMAN, W'. H. CLAWSON.

Copies of this paten'l may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

